Method for producing barium hydroxide and co-producing barium sulfate and sodium thiosulfate by barium sulfide

Abstract

The invention discloses a method for directly producing barium hydroxide and co-producing barium sulfate and sodium thiosulfate by barium sulfide, wherein the method comprises the following steps: S100, dissolving coarse barium sulfide black ash in process water with the temperature of 65-85 DEG C to prepare a clear barium sulfide solution with the concentration of 150-200 g / L for standby application; S200, introducing oxygen into the barium sulfide solution, and oxidizing barium sulfide; S300, filtering the solution obtained in the step S200 to remove impurities, cooling the clear solution toobtain a solution and crystal mixture A, and obtaining a mother solution B; S400, adding a sodium sulfate solution into the solution B to obtain a barium sulfate product, and filtering the solution to obtain a solution C; and S500, introducing oxygen into the solution C, and continuously oxidizing to obtain the sodium thiosulfate pentahydrate product. Barium hydroxide can be produced, barium sulfate and sodium thiosulfate can also be byproduced, and economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for directly producing barium hydroxide and co-producing barium sulfate and sodium thiosulfate by using barium sulfide. Background technique [0002] Barium hydroxide is mainly used for the manufacture of special soaps, insecticides, lubricants, hard water softening, beet sugar refining, boiler descaling, glass lubrication, and the manufacture of other barium salt chemicals. At present, there are two production methods of barium hydroxide octahydrate in my country. One method is to use barium chloride-sodium hydroxide method. The disadvantage of this method is that sodium chloride is produced at the same time. The value of sodium chloride is too low and it is difficult to sell. Another method is to calcine barium carbonate into barium oxide, and then leaching crystallization method, this method is labor intensive and has a greater impact on the environment. Contents of ...

AI Technical Summary

Problems solved by technology

At present, there are two production methods of barium hydroxide octahydrate in my country. One method is to use barium chloride-sodium hydroxide method. The disadvantage of this method is that sodium chloride is produced at the same time. The value of sodium chloride is too low and it is difficult to sell. Another method is to calcinate barium carbonate into barium oxide, and then leaching crystallization method, this method is labor intensive and has a great impact on the environment

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